public function testCheckNumberRelativityToZero()
{
$negativeValue = -53;
$this->assertTrue(Helpers::checkNumberRelativityToZero($negativeValue, -1));
$zeroValue = 0;
$this->assertTrue(Helpers::checkNumberRelativityToZero($zeroValue, 0));
$positiveValue = 53;
$this->assertTrue(Helpers::checkNumberRelativityToZero($positiveValue, 1));
$nonNumericValue = "This is a non-numeric value.";
$this->assertNull(Helpers::checkNumberRelativityToZero($nonNumericValue, 0));
}
/**
* @param $checkedVariable
* @return bool|null
*/
public static function checkIfNegativeNumber($checkedVariable)
{
return Helpers::checkNumberRelativityToZero($checkedVariable, -1);
}
